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Monday, 20 April 2026
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Physics Past Questions and Answers

Topic: Impulse and momentum

Jamb Physics Questions - Impulse and momentum

Question 1:
A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms-1. The recoil speed of the machine gun is
  • A 0.5 msec<sup style='font-size: smaller;'>-1</sup>
  • B 1.5 msec<sup style='font-size: smaller;'>-1</sup>
  • C 1 msec<sup style='font-size: smaller;'>-1</sup>
  • D 2 msec<sup style='font-size: smaller;'>-1</sup>
  • E 4 msec<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 2:
A rocket burns 0.01kg of fuel each second and ejects it as a gas with a velocity of 5,000m/s. What force does the gas exert on the rocket?
  • A 500,000N
  • B 500N
  • C 50N
  • D 5,000N
  • E 50,000N
View Answer & Explanation
Question 3:
A gun of mass 2.0kg fires a bullet of mass 16 x 10 -2kg due East. If the bullet leaves the nozzle of the gun with a velocity of 150ms-1, what is the recoil velocity of the gun?
  • A 150ms<sup style='font-size: smaller;'>-1</sup> due West
  • B 1.2 x 10<sup style='font-size: smaller;'>-4</sup>ms<sup style='font-size: smaller;'>-1</sup> due West
  • C 1.2ms<sup style='font-size: smaller;'>-1</sup> due West
  • D 1.2ms<sup style='font-size: smaller;'>-1</sup> due East
  • E 150ms<sup style='font-size: smaller;'>-1</sup> due East
View Answer & Explanation
Question 4:
A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms-1. What is the mass of the material ejected per second?
  • A 81.00kg
  • B 9.00kg
  • C 0.90kg
  • D 0.09kg
View Answer & Explanation
Question 5:
A body of mass 100g moving with a velocity of 10.0ms-1 collides with a wall. If after collision, it moves with a velocity of 2.0ms-1 in the opposite direction, calculate the change in momentum.
  • A 0.8Ns
  • B 1.2Ns
  • C 12.0Ns
  • D 80.0Ns
View Answer & Explanation